<template>
  <div>
    <div class="search-header">
      <!-- 后退按钮 -->
      <van-icon
        name="arrow-left"
        color="white"
        size="18"
        class="goback"
        @click="$router.back()"
      />
      <!-- 搜索组件 -->
      <van-search
        placeholder="请输入搜索关键词"
        v-model="kw"
        background="#007BFF"
        shape="round"
        @input="inputFn"
        @search="suggestFn"
        v-fofo
      />
    </div>
    <!-- 搜索建议列表 -->
    <div class="sugg-list" v-show="kw.length > 0" v-if="kw.length>0">
      <div class="sugg-item"  v-for="(str, index) in suggestionList"
      :key="index" v-html="lightFn(str)"  @click="suggestFn(str)"></div>
    </div>
    <!-- 搜索历史 -->
    <div class="search-history" v-else>
      <!-- 标题 -->
      <van-cell title="搜索历史">
        <!-- 使用 right-icon 插槽来自定义右侧图标 -->
        <template #right-icon>
          <van-icon name="delete" class="search-icon" @click="delFn" />
        </template>
      </van-cell>

      <!-- 历史列表 -->
      <div class="history-list" >
        <span class="history-item" v-for="(str,index) in history" :key="index" @click="$router.push({
          path:`/search/${str}`
        })">{{str}}</span>
      </div>
    </div>
  </div>
</template>

<script>
import { suggestionAPI } from '@/api'
import { setStorage, getStorage, removeStorage } from '@/utils/storage'
export default {
  data () {
    return {
      kw: '', // 搜索关键字
      timer: null, // 初始化防抖定时器
      suggestionList: [], // 联想菜单数组
      history: JSON.parse(getStorage('his')) || [] // 搜索历史
      // history: ['API', 'java', 'css', '前端', '后台接口', 'python'] // 搜索历史
    }
  },
  methods: {
    // 输入框查询
    inputFn () {
      clearTimeout(this.timer)
      this.timer = setTimeout(async () => {
        if (this.kw.length > 0) {
          const res = await suggestionAPI({ q: this.kw })
          this.suggestionList = res.data.data.options
        }
      }, 500)
    },
    // 关键字高亮显示
    lightFn (str) {
      const reg = new RegExp(this.kw, 'ig')
      return str.replace(
        reg,
        (match) => `<span style="color:red;">${match}</span>`
      )
    },
    // // input的 回车事件
    // searchFn () {
    //   this.history.push(this.kw)
    //   this.history = Array.from(new Set(this.history))
    //   localStorage.setItem('his', JSON.stringify(this.history))
    // },
    // // 联想列表添加
    // suggFn (str) {
    //   this.history.push(str)
    //   this.history = Array.from(new Set(this.history))
    //   localStorage.setItem('his', JSON.stringify(this.history))
    // },
    // 把回车事件和联想列表添加合并成一个方法
    suggestFn (str = this.key) {
      this.history.push(str)
      this.history = Array.from(new Set(this.history))
      setStorage('his', JSON.stringify(this.history))
      this.$router.push({
        path: `/search/${str}`
      }
      )
    },
    // 清空历史
    delFn () {
      this.history = []
      removeStorage('his')
    }
  }
}
</script>

<style scoped lang="less">
.search-header {
  height: 46px;
  display: flex;
  align-items: center;
  background-color: #007bff;
  overflow: hidden;
  /*后退按钮*/
  .goback {
    padding-left: 14px;
  }
  /*搜索组件*/
  .van-search {
    flex: 1;
  }
}
/*搜索建议列表样式 */
.sugg-list {
  .sugg-item {
    padding: 0 15px;
    border-bottom: 1px solid #f8f8f8;
    font-size: 14px;
    line-height: 50px;
    // 实现省略号的三行代码
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}
/**搜索历史 */
.search-icon {
  font-size: 16px;
  line-height: inherit;
}

.history-list {
  padding: 0 10px;
  .history-item {
    display: inline-block;
    font-size: 12px;
    padding: 8px 14px;
    background-color: #efefef;
    margin: 10px 8px 0px 8px;
    border-radius: 10px;
  }
}
</style>
